Extracting apparatus



Sept. 10, 1963 R. cs. SANDS 3,103,030

EXTRACTING APPARATUS Filed June 24. 1960 2 SheetsSheet 1 F/GB.

' Inventor ROBERT G, SANDS A ttorneys Sept. 10, 1963 R. G. SANDSEXTRACTING APPARATUS Filed June 24. 1960 2 Sheets-Sheet 2 ONKO llmlll11ml Inventor ROBERT G. SANDS BYMMM A tlorneys United States Patent3,103,030 EXTRACTING APPARATUS Robert George Sands, Orpington, England,assignor to Carrier-Ross Engineering Company Limited, London,

England, a company of Great Britain Filed June 24, 1960, Ser. No. 38,518

Claims priority, application Great Britain June 25, 1959 1 Claim. (Cl.15--306) This invention relates to extracting apparatus and inparticular to apparatus for concentrating a sucking force on a zone of adrier roll intended for drying a continuous Web of material by directcontact with the roll.

It is a main object of the present invention to provide extractingapparatus in which a constant depression is maintained at the entranceof nozzles disposed side by side.

Accordingly, the present invention comprises a series of interchangeablenozzles of varying cross-section mounted on a suction (duct incommunication therewith whereby on selecting nozzles of suitablecross-section a uniform sucking force is applied at the mouths of thenozzles.

Preferably the suction duct comprises a linear series of throats to eachof which is attached a ferrule of tapering cross-section which issecured in position in the throat by being clamped between the throatand the nozzle and which progressively spreads in an outward directionfrom the ferrule and terminates in a narrow slot.

In order that the invention may be more clearly understood, anembodiment thereof will now'be described by way of example, withreference to the accompanying diagrammatic drawings, in which:

FIGURE 1 shows a section through a suction duct with nozzles accordingto the invention mounted relative to a doctor blade arranged to scrape aroll surface,

FIGURE 2 shows in elevation and to an enlarged scale a preferred mannerof connecting a nozzle to the suction duct,

FIGURE 3 is a sectional elevation of line IIIIII of FIGURE 2, and

FIGURE 4 is a view in the direction of arrow A in FIGURE 1, indicatingthe graduated taper of ferrules for the nozzles.

In the drawings, like reference numerals designate the same or similarparts.

Referring to the drawings, FIGURE 1 illustrates the crest portion of aroll -1 over which a suction duct 2, the axis of which is parallel tothe axis of the roll. The suction duct 2 is provided with a linearseries of throats, 3, FIGURE 4 to each of which is attached, ashereinafter described, a nozzle 4, the duct 2 being connected to anexhausting system by a connecting duct 21, and the mouths of the nozzles4 being [disposed side-by-side in relation to the surface of the roll 1along the roll, such that the exhaust system produces at the nozzles thedesired suction force over a zone running lengthwise of the roll, thatis, parallel to the generatrices of the roll, and extending for thelength of the roll. The suction duct 2 may be closed at one end andconnected at the other end to a main duct of an exhausting system by theconnection duct 21, but each end of the duct 2 may be provided with aflexible connection to the main duct.

The duct 2 where it is connected to a main duct of an exhausting systemis supported at one end by the connection duct 21 being carried in abearing block 22, and is carried or supported within a circular airtight housing such that the duct 2 is capable of rotation about itsaxis. At the other end the :duct is sealed by a blanlc disc 5 providedwith a projecting spindle or trunnion 6 centrally disposed. This spindleis carried in a bearing (not shown) mounted on the machine frame, and toits extremity is attached a worm wheel 7 driven by a worm 8. The wormand worm wheel serve the dual purpose of retaining the nozzles 4 inclose proximity to a doctor blade 9 and providing a means of manualadjustment of the duct 2 as required to compensate for the wear of thedoctor blade 9 or to swing the nozzles 4' clear of the doctor blade 9 toenable this to be removed from contact with the cylinder 1 for access tothe blade 9.

The doctor blade 9 is mounted in known manner on a doctor back orsupport 10* of circular section, which is mounted relative to the rollso that it can be rotated to lift the doctor blade 9 away from theroll 1. To this end the doctor back 10 is provided with a spindle (11 ateach end carried in fixed bearings (not shown) attached to the machineframe, the assembly thus being rotatable about the centre lines of thespindles.

The nozzles 4 and the doctor blade 9 are operatively associated in sucha way that as the roll rotates in the direction of the arrow 12, thesuction force applied to the roll assures that the latter is continuallycleaned by collecting the debris as it is detached by the doctor blade 9from the roll.

As illustrated in FIGURES 2 and 3, each throat 3 is threaded to arespective neck 13 formed on the duct 2 and is flanged on its lower partas indicated at 14 to support a clamping ring '15 which is in threadedengagement with the head 16 of the nozzle walls 17. Clamped between theflange 14 of the throat 3 and the head 16 of the nozzle is flange 18 ofa ferrule 19.

Accordingly, by rotating the ring 15 the nozzle is released and theferrule can be removed and exchanged for another ferrule, whereon thenozzle will be replaced and the ring reversely rotated to clamp thesubstituted ferrule in position. r

The ferrule 19 has a tapering inner wall 20 and the taper of the innerwall determines the pneumatic depression in the respective throat andnozzle. By grading the internal taper '20 of the ferrules along thesuction duct, as indicated diagrammatically in FIGURE 4, a constant airvelocity along the length of the roll is achieved for the air enteringthe series of nozzles. Thus, the combined assembly of nozzles andsuction duct can be adjusted to perform the required duty on the rollsurface at the time of installation and the arrangement detersunauthorised interference with the setting of the nozzles. At the sametime the manner of connecting the elements of the nozzle structure issuch that a rigid construction is obtained, thereby preventinginadvertent slacking of the arrangement due to vibration or other cause.

From the foregoing it will be appreciated that a rigid nozzle structureis obtained in which the velocity of air entering the slots is uniformalong the length of the zone to which suction is applied when the nozzleferrules are appropriately graded to maintain a constant depression inthe throats and the nozzle mouths.

By employing a means for immediately removing the debris from thevicinity in which it is detached from the roll, there is no opportunityfor the debris to contaminate the web being dried on the roll or tobecome airborne and eventuallysettle on dilferent parts of the machine,which may result in faulty lubrication and indeed constitute a potentialfire hazard.

I claim:

Extracting apparatus for concentrating a uniform sucking force on a zoneof a drier roll intended for drying a continuous web of material bydirect contact with the roll, to collect debris detached from a zone ofthe roll, comprising a suction duct of uniform cross section formounting lengthwise of the roll, means for applying"'suction to theduct, a linear series of equispaced throats of circular cross section insaid duct, a series of identical suction nozzles respectively attachedto said throats, each .nozzle progressively spreading from a circularcross section outlet and terminating in a narrow slot-shaped inlet whichslot-shaped inlets are disposed si'cle-by-side parallel to a geneatrixof the roll, and a series of'interchangeable ferrules of conicalinternal cross section' each connecting one said nozzle to itsassociated throat in' that duct, an end of each ferrule terminatingadjacent a nozzle outlet and having an internal circular cross sectionequal to that of the nozzle outlet, and the internal conical taper ofthe ferrules being progressively decreased along the duct from theconnectionv of vthev duct to said suction means so that on theapplication of suction to the duct, air entering all the nozzle inletshas the same velocity and a constant depression is produced over saidzone of the roll,

References Cited in the file of this patent UNITED STATES PATENTS1,143,052 Kerr June 15, 1915 1,196,437 Doyle Aug. 29, 1916 1,196,438Doyle et a1. Aug. 29-, 1916 1,298,471 Dodge Mar. 25, 1919 2,413,937Zadernach et al'. Ian. 7, 1947 2,810,607 Hruby Oct. 22, 1957 I FOREIGNPATENTS 811,499 France Apr. 15, 1937

